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MCPE-186928

Chunks in all dimensions have their biome replaced with an Ocean biome upon reloading in updated older worlds created prior to <1.17.40

In worlds created prior to 1.17.40 (as of my testing) and or updated to the Non-Preview (1.21.30 currently) changes parts of the Nether Biomes to an Overworld Biome (most likely Ocean) upon reloading for a second time wiping out the Nether Biome data in some chunks.

Steps to reproduce:

  1. Import the provided test world into 1.21.40.23 Preview and load

  2. Observe the Nether Biomes are expected

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  3. Enter the portal and come back or Exit the world and rejoin it

  4. The Nether Biomes switched to an Overworld Biome and the fog is gone

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The Overworld and End dimensions are also affected by this issue.

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migrated

This is somehow related to world with custom biomes enabled. I enabled it without knowing what kind of feature was that back in 2020 (prob around nether update 1.16.100). Mine had one and now wipes off biome data every time I reload my world ever since I upgraded to version 1.21.40.x.

I am stuck playing with v1.21.30.x for stability.

Edit: It also appears to be an intentional world-breaking feature. I hope this will be reverted as it destroyed my world biomes.
https://feedback.minecraft.net/hc/en-us/articles/30556182663437-Minecraft-Beta-Preview-1-21-40-23

[media]
migrated

This is somehow related to world with custom biomes enabled. I enabled it without knowing what kind of feature was that back in 2020 (prob around nether update 1.16.100). Mine had one and now wipes off biome data every time I reload my world ever since I upgraded to version 1.21.40.x.

I am stuck playing with v1.21.30.x for stability.

Edit: It also appears to be an intentional world-breaking feature. I hope this will be reverted as it destroyed my world biomes.
https://feedback.minecraft.net/hc/en-us/articles/30556182663437-Minecraft-Beta-Preview-1-21-40-23

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Wafity

yay, it is fixed

tmc249

(Unassigned)

1314618

Confirmed

Multiple

Windows 11

1.21.50.24 Preview, 1.21.50.20 Preview, 1.21.40.25 Preview, 1.21.40.21 Preview, 1.21.40.23 Preview

1.21.50.25 Preview, 1.21.41 Hotfix

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